He should have stayed where he was, and maybe done something to attract attention, like if you had the means, burn the spare tire setting off a column of black smoke.
The helicopter pictures of their car shows lots of trees near-by.
One could have found lots of dry branches and some small dead trees to build a large fire on that dirt road. The fire could have been going 24 hours day and night.
The smoke would have been seen by passing airplanes in the day time and flames at night.
Plus the warmth would have been helpful.
The point of the above is not to be critical, but to help some lurker here who may get lost in the future.